1774, from German Schwindler "giddy person, extravagant speculator, cheat," from schwindeln "to be giddy, act extravagantly, swindle," from Old High German swintilon "be giddy," frequentative form of swintan "to languish, disappear;" cognate with Old English swindan, and probably with swima "dizziness." Said to have been introduced in London by German Jews c.1762.

swindle

v.

1782, back-formation from swindler. Related: Swindled; swindling. As a noun from 1833.